Qtek 1010 Replacement Battery 3.7V 1700mAh 35H10008-80

Qtek 1010 — 3.7V Li-Polymer Replacement Battery (35H10008-80)

This is a 3.7V 1700mAh lithium-polymer battery for the Qtek 1010 Windows Mobile smartphone. It replaces OEM part 35H10008-80 directly. The Qtek 1010 uses a slim LiPo cell measuring 94.33 × 50.53 × 3.49mm — physical fit matters as much as electrical spec on this form factor.

• Qtek 1010 platform fit: The 1010 uses a single-cell 3.7V nominal LiPo architecture. The connector pinout and BMS communication lines match the original HTC-sourced hardware that underpins this device. No adapter or modification is needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under screen-on and modem-active loads. The BMS held cutoff voltage correctly at both ends, and the protection circuit tripped as expected under short-circuit simulation.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to automatic shutdown before recharging. The Qtek 1010's fuel gauge IC is calibrated against its coulomb counter — a complete cycle anchors the new cell's discharge curve so percentage readings stay accurate.

Why the Qtek 1010 reports wrong battery percentage after a cell swap

The Qtek 1010 uses a fuel gauge IC that tracks charge state by counting coulombs against a stored discharge curve from the original cell. A new cell has a different internal resistance profile, so the IC's stored curve no longer matches reality. This causes the percentage display to read high or low by a significant margin — sometimes 20% or more. One complete discharge-charge cycle lets the IC relearn the new cell's actual capacity and voltage endpoints. After that cycle, percentage accuracy returns to normal.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under high-current draw — typically during an active call or screen-on GPS use — before the fuel gauge registers a low state. The LiPo cell cannot sustain its voltage rail under that load once it crosses a threshold around 3.5–3.6V per cell, and the protection circuit cuts power immediately. It is not a faulty battery. Perform one full conditioning cycle first, then check that the phone shuts down automatically at approximately 3.4V under light load.